| Title: |
Device and related method for converting display screen into touch panel screen |
| Document Number: |
20100328200 |
| Publication Date: |
December 30, 2010 |
| Appl. No: |
12/822187 |
| Application Filed: |
June 24, 2010 |
| Abstract: |
A device for converting display screen into touch panel screen includes a projection screen; an image projection unit for projecting an image on the projection screen; a light pointer for emitting a light spot signal of a specific wavelength on the projection screen; an image detecting unit, which includes a fisheye lens for receiving the image on the projection screen to generate a fisheye distorted image; and an optical filter for filtering out the optical energy except the light spot signal of the specific wavelength; an image processing unit, coupled to the image detecting unit, for calculating a first position of the light spot on the projection screen according to the fisheye distorted image; and a message transmitting unit, coupled to the image processing unit, for outputting a touch panel signal according to the calculating result of the image processing unit. |
| Inventors: |
Yu, Chi-Chang (Keelung City, TW); Tzeng, Chih-Yang (Taipei County, TW); Chen, Homer H. (Taichung City, TW); Lin, Meng-Chun (Taipei City, TW); Yeh, I-Hau (Hsinchu City, TW); Chen, Hong-Cheng (Hsinchu City, TW) |
| Claim: |
1. A light pointing touch panel display device, which converts a display screen into a touch panel screen, comprising: a projection screen; an image projection unit for projecting an image on the projection screen; a light pointer for emitting a light spot signal of a specific wavelength on the projection screen; an image detecting unit, comprising: a fisheye lens for receiving the image on the projection screen to generate a fisheye distorted image; and an optical filter for filtering out the optical energy except the light spot signal of the specific wavelength; an image processing unit, coupled to the image detecting unit, for calculating a first position of the light spot on the projection screen according to the fisheye distorted image; and a message transmitting unit, coupled to the image processing unit, for outputting a touch panel signal according to the calculating result of the image processing unit. |
| Claim: |
2. The light pointing touch panel display device of claim 1, wherein the image processing unit further comprises: a receiving unit for receiving the fisheye distorted image; a recognition unit for determining the first position according to a second position having a fisheye distorted coordinate in the fisheye distorted image; a calculating unit for calculating the fisheye corrected coordinate of the fisheye corrected image from the fisheye distorted coordinate according to a coordinate transfer function between the fisheye distorted image and the fisheye corrected image, wherein the fisheye corrected coordinate corresponds to the first position on the projection screen; and an output unit for outputting the fisheye corrected coordinate. |
| Claim: |
3. The light pointing touch panel display device of claim 2, wherein the coordinate transfer function comprises a fisheye correction coordinate transformation, a keystone correction coordinate transformation. |
| Claim: |
4. The light pointing touch panel display device of claim 1, wherein the specific wavelength is of an infrared wavelength. |
| Claim: |
5. The light pointing touch panel display device of claim 1, wherein the maximal azimuthal angle of the fisheye lens between 120 to 160 degrees. |
| Claim: |
6. The light pointing touch panel display device of claim 2, wherein the touch panel signal comprises the fisheye corrected coordinate. |
| Claim: |
7. A light pointing touch panel detecting method, which is utilized for converting a display screen into a touch panel screen, comprising: projecting an image on a projection screen; emitting a light spot signal of a specific wavelength on the projection screen; receiving the image on the projection screen to generate a fisheye distorted image; filtering out optical energy except the light spot signal of the specific wavelength; calculating a first position of the light spot on the projection screen according to the fisheye distorted image; and outputting a touch panel signal according to the calculating result of the image processing unit. |
| Claim: |
8. The light pointing touch panel detecting method of claim 7, wherein calculating the first position of the light spot on the projection screen according to the fisheye distorted image comprises: receiving the fisheye distorted image; determining the first position according to a second position having a fisheye distorted coordinate in the fisheye distorted image; calculating the fisheye corrected coordinate of the fisheye corrected image from the fisheye distorted coordinate according to a coordinate transfer function between the fisheye distorted image and the fisheye corrected image, wherein the fisheye corrected coordinate corresponds to the first position on the projection screen; and outputting the fisheye corrected coordinate. |
| Claim: |
9. The light pointing touch panel detecting method of claim 8, wherein the coordinate transfer function comprises a fisheye correction coordinate transformation, a keystone correction coordinate transformation. |
| Claim: |
10. The light pointing touch panel detecting method of claim 7, wherein the maximal azimuthal angle of the fisheye lens is between 120˜160 degrees. |
| Claim: |
11. The light pointing touch panel detecting method of claim 8, wherein the touch panel signal comprises the fisheye corrected coordinate. |
| Current U.S. Class: |
345/156 |
| Current International Class: |
06 |
| Accession Number: |
edspap.20100328200 |
| Database: |
USPTO Patent Applications |
